Question

When does raisins swell ? When we put the raisins in tap water or rain water?

Answer 1

in both the raisin swell up in tap water and also in rain water .
It swell up by the process of endosmosis.
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Answer 2

Raisin swell when we it into rain water because the rainwater is the purest form of water which mean it does not contain any solute . so there is more water concentration outside the cell than inside , thus water will move inside through osmosis and cell I.e raisin will swell up.